Annabeth is also a very popular choice. Her intelligence and her relationship with Percy are often explored in fanfics. Writers might create scenarios where she uses her smarts to solve complex problems or where her relationship with Percy is put to the test in new and interesting ways.
Annabeth Chase is also a fan favorite. Her intelligence and strong will make her a great character to explore in fanfiction. Writers might focus on her architectural projects in the context of the demigod world, or her relationship with Percy from different angles.
Percy Jackson is definitely one of the most popular. His adventures in the main series make him a natural fit for fanfics involving Artemis. He has the skills and the courage to get involved in any situation.
Percy himself is really popular. After all, the series is named after him. Fanfiction writers often like to put him in new and unexpected situations. Another popular character is Annabeth. Her intelligence and strategic mind make her a great addition to any new story line. Nico di Angelo is also quite popular as his dark and brooding nature offers a lot of potential for character development in drop - in fanfiction.
Jason Grace is a character that features a lot in fanfiction. His leadership skills and his connection to the Roman side of the demigod world are interesting aspects to write about. Fanfiction writers may explore his relationship with Percy, especially how they combine their different leadership styles when facing challenges together, and his struggle to adapt to the Greek demigod world after being brought to Camp Half - Blood.
Percy Jackson himself is very interesting. His journey from an ordinary kid to a powerful demigod is captivating. Also, Annabeth Chase is great. She is smart and brave, always helping Percy out with her knowledge of Greek mythology.
Definitely Danny and Percy are the most prominent. However, in some more creative fanfictions, characters like Jazz from Danny Phantom might be included. She could offer a different perspective as Danny's sister, perhaps trying to understand the Percy Jackson world from a more scientific or psychological angle. And from Percy Jackson, Nico di Angelo could be a great addition. His powers over the dead could have some really interesting interactions with the ghosts in Danny Phantom. But still, Danny and Percy are the ones that draw the most attention as they are the face of their franchises and the ones that most readers want to see in these crossovers.
Athena is also a favorite. Her wisdom and strategic mind can make for some really interesting plotlines. A fanfic could focus on a demigod who is seeking her guidance or on a conflict between Athena and another god where the demigods get caught in the middle. And her owl is a recognizable symbol that can add a nice touch to the story.
Nico di Angelo is another popular character in these fanfics. His control over the dead and shadow - traveling abilities offer a lot of room for creativity. Fanfic writers often give him new powers or expand on his existing ones, like making his control over the dead more powerful or adding new elements to his shadow - traveling. His brooding and mysterious nature also makes him an interesting character to write about in the context of powers.
Obviously Percy himself is very popular. Since it's a 'Percy Jackson Reacts' scenario, he's at the center of it all. Fans love to write about his reactions.
Percy Jackson himself is obviously very popular. His powers over water and his heroic nature make him a central figure in many fight scenes.